单项选择题
How should you warm up a diesel engine that has not been run for some time? （）
A.Run it at minimum speed for a period of time B.Run it at half speed for a period of time C.Bring it to top speed immediately D.Inject ether into the air intake
单项选择题 How does combustion air enter the cylinder of a two-cycle diesel engine?（）
单项选择题 Generally speaking，the fuel injected into a marine diesel engine combustion chamber is ignited by（）.
单项选择题 For most ship engines，the fuel is（）.
